Truck With No APU

The issue is oil pressure, not a specific RPM. My fast idle is set at 700. The higher you idle it the more fuel it will use.

 

I heard is actually bad for these new engines. The older pre emissions ones is good to high idle so you don’t get cylinder wash (diesel washing the cylinders and reducing effectiveness of motor oil). The new engines some mechanics told me high idling is bad for the EGR apparently don’t quote me on it though. Guess these new engines don’t like idling at all best to just have an APU for downtime.

 

I would care less about fuel than engine

 

I actually have freshly rebuilt 1999 c16 , cant say much about newer engines with dpf and EGR

 

It's a 2020 Freightliner Cascadia. It will run about 6 hours on the batteries. When the batteries get to 12.1 volts the engine will start and run 2 hours to recharge them. Truck has about 250amp alternator. The electric a/c is basically for cooling the sleeper. If I park 10 hours engine will only idle 2 hours one time. That pretty good for 10 hours of a/c or heating.

Freightliner has a system called Optimized Idle. It will monitor the engine oil temperature, battery volts and sleeper temperature. When needed it will start the engine to charged the batteries or maintain sleeper temperature or engine oil temperature. My truck has that plus it has this extra electric a/c from Freightliner and 4 more extra batteries. Plus a bigger alternator. So I have 8 batteries on my truck. 4 are in standard location driver side. Then 4 more are behind sleeper between frame rails.. I have not figured out if all 8 are hooked together or if the 4 behind sleep are just being used to run a/c

 

Westerns policy is above 74 and below 36. They’ll idle for maybe 15 minutes outside those temps.

If you buy a inverter and they find it during a PM they’ll toss it.

Many trucks were never checked to see what their programming was when received from the factory. So it may infinity idle, or shut off after 5 min.

Western doesn’t care if you freeze or cook. Your DM can help you get the truck set up. If you’re truck will idle all night say nothing about it.

 

I see lots of mega trucks idling all the time. I think the reason why their policies say no idling is because they want to keep their fuel expenses down and because some state laws prohibit idling more than 5 minutes.

 

For the DD15, the maintenance manual says that idling at 900 RPM should be enough for heating purposes when temperatures are over 32 F.

In my truck, I need to set the cruise control to keep my truck from turning off after 5 minutes. With the cruise control on, the engine idles at 900 RPM.

Edit—

There might be a way to change the RPM idling speed on the DD15. Document below.

 

Any idling will kill new euro 4 engines because they're not producing enough heat to cook off the DPF and even with parked regens it's not doing any favors to the engine. People wonder why these new motors don't last 500,000 miles and it's due to excessive idling with engine designs that self destruct from it.

 

The new engines ECM will start regeneration when it needed. I hate when it's parked next to me and start fan screaming, sometime every hour, all night long.